Programming-Idioms

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2016-01-01, 00:45:38

2016-01-01, 01:38:26

Idiom #33 Atomically read and update variable

Assign variable x the new value f(x), making sure that no other thread may modify x between the read and the write.

Assign variable x the new value f(x), making sure that no other thread may modify x between the read and the write.

import "sync"

import "sync"

lock := &sync.RWMutex{}

lock.Lock()
x = f(x)
lock.Unlock()

lock := &sync.RWMutex{}

lock.Lock()
x = f(x)
lock.Unlock()

You need to lock whenever accessing x

You need to lock whenever accessing x.

https://golang.org/pkg/sync/

https://golang.org/pkg/sync/

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